Grinding-wheel.



PATENTED JAN.10. 1905.

G. HART.

GRINDING WHEEL.

APPLIOATION FILED AUG.31,1904.

mg m B n H fl U |'1\I V I WNW l H I UNIT D STATES Patented January 10, 1905.

GILBERT HART, OF DETROIT, MICHIGAN.

GRINDING-WHEEL.

SPECIFICATION forming part of Letters Patent No. 779,848, dated January 10, 1905.

Application filed August 31,1904. Serial No. 222,884.

To all whmn it may concern:

Be it known that I, GILBERT HART, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented new and useful Improvements in Grinding-Vheels, of which the following is a specification.

This invention relates to grinding-wheels.

The improved wheel involves in its makeup a spider, which may be of any desirable material, such as iron, and a plurality of segments of suitable abrasive material, such as emery, arranged to abut end to end on the periphery or rim of said spider.

It is the primary object of my invention to provide means of a simple character for holding these segments firmly and solidly in place, but in such a way that when one or more of them becomes worn or injured the same can be readily removed to be replaced by new ones.

The improvements are of particular adaptability to grinding wheels of large size requiring a considerable amount of horse-power to operate the same and in which the segments should be held in place in the strongest possible way.

In the drawings accompanying and forming a part of this specification, I represent a grinding-wheel involving my invention, which I will fully set forth in the following description; but I do not limit myself to the exact showing thus made, for certain variations may be adopted within the scope of my claims succeeding said description.

In the drawings, Figure 1 is a face view of a grinding- Wheel involving my invention. Fig. 2 is a central sectional elevation of the same.

Like characters refer to like parts in both figures.

The spider for the wheel is designated in a general way by 5 and ordinarily consists of iron. It is shown as having a wide periphery or rim, with which are associated the segments 6, of any desirable number, and the width of which equals that of the periphery or rim of the spider. The segments when in assembled relation abut end to end, and they may be of any desirable material, such as emery, molded when in a plastic condition to the desired shape. Each segment is molded onto a plate, as 7, the respective plates and segments being interlocked together in a firm manner and in such a way as to prevent the distortion thereof by centrifugal action. The segmental plates 7 fit against the outer face of the rim of the spider and when in assembled relation abut end to end to present practically a continuous structure, and in such relation they are securely held to the spider 5. The plates 7 are represented as having at their opposite ends outward projections, as 8, which are shown as being of dovetailed form. Between the projections 8 are other outward projections, as 9, shown as anchor-bolts tapped into the plates 7. Each segment is molded onto a plate 7 while the substance of the segment is in a plastic condition. This results in the embedment of the dovetailed projections 8 and the headed projections 9 in the body of the segments, whereby the plates and segments will be interlocked in a positive way. The presence of the dovetailed projections 8 provides for the formation of relatively deep seats near the opposite ends of the plates to receive holding-bolts, while the anchor-bolts 9- between said projections 8 serve when the parts are in assembled relation to prevent outward displacement of the intermediate portions of the segments by centrifugal action. I do not limit myself, of course, to the number of projections 8 and 9, the same depending upon the size of the wheel.

Through the rim of the spider are formed perforations, as 10, to receive holding-bolts, as 11, the heads of which engage the inner side of said rim, while the threaded portions thereof fit threaded holes formed near the opposite ends of the plates 7 coincident with the dovetailed or outwardly-widened projections 8. It will be understood that the projections 8 increase in width toward their outer ends.

To connect the segments 6 with the rim of the spider, the plates 7 are set against said rim with their ends abutting, after which the threaded portions of the bolts 11 are passed through the perforations 10 from the inner side of the rim into the tapped holes in the inner side of the plates, following which said bolts are tightened up to rigidly hold the segments in continuous order about the periphery of the spider. 1n the construction illustrated there are two annular series of bolts 11, located at opposite sides of the web of the spider and fitting correspondingly-disposed tapped holes in the circularly-arranged segments. By removing the bolts 11 the segments 6 can be removed.

Having thus described the invention, what I claim is 1. A grinding-wheel having a spider, a plurality of segments of abrasive material in endto-end abutting relation around the rim of the spider, and plates fitted against the rim and rigidly associated with the spider, and upon which said segments are imposed.

2. A grinding-wheel having a spider, a plurality of segments of abrasive material in endto-end abutting relation around the rim of said spider, and plates between the respective segments and rim, interlocked with the segments and detachably associated with said spider.

3. A grinding-wheel having a spider, a plurality of segments of abrasive material, plates on which the segments are molded, the plates having projections embedded in the segments to hold the parts in interlocked relation, and means for connecting the plates with the rim of the spider.

4. A grinding-wheel segment of abrasive material and a similarly-shaped plate, the segment being molded to the plate and the curved portions thereof being interlocked.

5. A grinding-wheel segment of abrasive material, and a plate, the segment being molded on the plate, and the latter having dovetailed projections at its opposite ends embedded in the segment.

6. A grinding-wheel of abrasive material, and a plate, the segment being molded on the plate, and the latter having dovetailed projections at its opposite ends embedded in the segment, and other projections between said first-mentioned projections, also embedded in the segment.

7. A grinding-wheel segment of abrasive material, and a plate, the segment being molded on the plate, and the latter having projections embedded in the segment and of increasing width toward their outer ends.

8. A grinding-wheel segment of abrasive material, and a plate, the segment being molded on the plate, and the latter having projections embedded in the segment and of increasing width toward their outer ends, and headed bolts tapped in the plate, the heads of the bolts being embedded in the segment.

9. A grinding-wheel having a spider, a plurality of segments of abrasive material arranged in end to-end abutting relation around the rim of the spider, plates between the rim and segments, the plates being in interlocked relation with the respective segments and each plate having bolts tapped thereinto for holding the same in assembled relation with the rim of the spider.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

GILBERT HART.

l/Vitnessesz' MIoHAEL H. DEMPSEY, WM. A. SCHULTZ. 

